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Item Forces due to short circuit in a 400 kV outdoor substation: A study(Institute of Electrical and Electronics Engineers Inc., 2018) Sudarshan, V.J.; Punekar, G.S.Short circuit force (SCF) in an EHV substation is an important attribute for the electromechanical design of a substation. Hence, computation of SCF becomes mandatory for the substation design. The conductor phase to phase spacing within the EHV substation is an important parameter which influences the SCF. Also, in a flexible-conductor-bus, in the event of a short circuit, there will be variation in of phase to phase air clearances (dynamic) and conductor-sag (dynamic). The air clearances at any conditions should satisfy the minimum phase to phase clearance as per standard to assure safety and avoid secondary faults. The conductor-sag should also be within acceptable limits. As the conductor phase to phase spacing is varied, air clearances as well as conductor sag varies. The SCF in a 400kV substation, with flexible-bus-conductor's, is computed as a case study. With this SCF, variation in air clearances and conductor-sag are computed and analyzed. The margin given in design and construction of bus conductor spacing and their sag during static conditions are good enough even under the short circuit conditions resulting in SCF and reduced conductor spacing due to dynamic reduced phase to phase clearances and sags. © 2018 IEEE.Item Short circuit force in an AIS with special reference to L-L and L-L-L faults(Institute of Electrical and Electronics Engineers Inc., 2018) Sudarshan, V.J.; Punekar, G.S.Short circuit force (SCF) in an air insulted substation is a feature which is of importance in its electromechanical design. SCF which are generated due to short circuit current is transferred from conductors (flexible or rigid) to end connections where the conductors are being held. The end connections and the conductor are supported by means of insulator, steel structure, and foundation. Thus, SCF is transferred from conductors to end connections and then to steel structures via insulator. If estimation of SCF is erroneous, then the end result will be a disaster (as the structural designs are based on this). On the other hand, too much conservative structural designs based on the estimated SCF results in increased size and cost of insulators, steel structure, and foundation requirements. Hence, the computation of SCF becomes mandatory in design of the substation from the reliability and economic considerations. In this paper, SCF in a 400 kV air insulated (upcoming) substation (in Africa) due to line-to-line short circuit currents and three phase short circuit currents on flexible conductor are computed using basic electromagnetic laws and are discussed. The computed values are compared with the values of SCF obtained as per IEC 60865 standard. © 2018 IEEE.